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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 16 |
| 3 | 240 |
| 4 | 7868 |
| 5 | 738031 |
| 6 | 186969392 |
| 7 | 118984786902 |
| 8 | 191430611504482 |
| 9 | 791786310866344064 |
| 10 | 8423565813650647334361 |
| 11 | 229714505025192315490199222 |
| 12 | 16049804227721101224353628972128 |
[2,16,240,7868,738031,186969392,118984786902, 191430611504482,791786310866344064, 8423565813650647334361, 229714505025192315490199222, 16049804227721101224353628972128] |